2025 Volume 81 Issue 13 Article ID: 24-13554
In quality control for laminated rubber bearings used in road bridges, verification tests are conducted on 240mm and 400mm bearings to evaluate their mechanical capacity. On the other hand, due to the limitations of loading capacity of the testing machine, it has been difficult to conduct experiments at full-scale and full-speed in the past. Since in 2023, a full-scale seismic isolation testing facility (E-Isolation) was installed, making it possible to conduct full-scale, full-speed testing in Japan. In this study, we used that testing machine to confirm the effects of large strain cyclic shear deformation on the characteristics of full-scale laminated rubber bearings. The results showed that the number of cycles, the period (velocity), temperature, and loading interval all had an effect on the stiffness and damping coefficient, and also showed the relative magnitude of the effect of each of these factors on the stiffness and damping coefficient.
